20mm PAN fiber chopped strands were cut from polyacrylonitrile filament&comma;the chopped strands is designed for reinforced concrete and asphalt pavement&comma;it can combine solidly with concrete aggregates&comma; additives&comma;admixtures and cement&period;This chopped strands anti-acid and alkali&comma;no lose in a strong for 100days&comma;same as well in strong alkali&comma;therefore it will not be any corrosion in alkaline hydrolysis of the concrete&period;it can maintain the status for 50 years&comma;to play its long-term effectiveness&comma; control of concrete&sol;mortar plastic shrinkage&comma;drying shrinkage&comma;micro-cracks caused by temperature changes and other factors&comma;to prevent and suppress the formation and development of cracks&comma; greatly improving crack resistance of concrete&comma;impact resistance and impermeability&comma;to prevent cracking of the concrete part surface&period;

Specifications&colon;

Model&colon;

XGPF0720

Color

yellowish

Material Shape

Boundle of monofilament

Material composition

100&percnt; polyacrylonitrile

Equivalent diameter &lpar;μm&rpar;

7

Length &lpar;mm&rpar;

20±1

Specific Gravity&lpar;g&sol;cm3&rpar;

1&period;18

Melting point &lpar; °C &rpar;

>230

Tensile strength &lpar;MPa&rpar;

715~875

Elastic Modulus&lpar;GPa&rpar;

7&period;1~16&period;3

Elongation at break &lpar;&percnt;&rpar;

9~15

Chemical properties

Resistance of acid&comma;alkali

PROPERTIES&colon;1&period;To prevent concrete cracking&colon;Concrete cracks occurred mainly before concrete harden&comma;due to the evaporation and transferring of moisture&comma;thereby causing the generating of internal plasticity crack&period;After incorporation of PAN fiber chopped strands&comma;Inside the concrete to form a homogeneous three-dimensional non-directional distribution support system&period;delay and prevent early onset and development of plastic cracks of concrete&comma; and therefore play a more effective role in cracking toughening&period;0&period;05&percnt; volume dosage&comma;the crack resistance can be increased 70&percnt;&period;2&period;Improve waterproof and impermeability of concrete&period;After the concrete &lpar;mortar&rpar; incorporation of a small amount of PAN chopped strands&comma;inhibit the emergence and development of early shrinkage cracks and segregation cracks&period;The concrete &lpar;mortar&rpar; porosity is greatly reduced&comma; so that the concrete &lpar;mortar&rpar; impermeability greatly improved&comma;it can be used for concrete projects require high impermeability&period;0&period;05&percnt; volume adding dosage&comma;impermeability capacity can be increased more than 60&percnt;&period;3&period;Improve the impact resistance of concrete&period;PAN fiber chopped strands and cement-based material has a very strong binding force&comma;the fiber can be quickly and uniformly mixed with concrete to form a three-dimensional non-directional support system&comma;when the concrete stand tension and shock&comma;evenly distributed and larger numbers of fibers play a role of absorption energy and sharing stress&period;4&period;Improve abrasion resistance of concrete&period;Concrete incorporation of a small amount of fiber&comma;it can control plastic shrinkage and plastic settlement cracks&comma;surface texture uniform bleeding pulp film&comma;while the three-dimensional non-directional fiber system can absorb more energy&comma;enhanced concrete abrasion resistance&period;tests showed that it double the service life after adding fibers&comma;in particular for roads and water conservancy construction project&period;5&period;improve shotcrete anti-fatigue and reduce loss-rebound rate Concrete mixing a small amount of fibers has a high viscous&period;For spraying concrete&comma;it can form a thick layer of concrete&comma;significantly reduce concrete rebound rate&comma;therefore&comma;increase the thickness of the molding&comma; reduce material loss in construction&comma;improved project quality and reduce overall costs&period;6&period;Increase the ability of concrete antifreeze and anti-temperature difference&period;because fibers having macromolecular structures&comma;when the outside temperature is 40 °C&comma;Concrete incorporation of the fibers has a shrinkage&semi; -40°C&comma; the glassy and crystalline macromolecules has resistance to shrinkage&comma;these properties make up concrete's thermal expansion and contraction properties&comma;ease stress in concrete caused by temperature changes&comma;to prevent extended temperature cracks&period;It can be widely used in cold areas concrete projects&period;7&period;Good finishing properties&period;PAN fiber chopped strands is a fine monofilament fiber&comma;unlike some other rigid additive materials&comma;which will expose concrete surface and affect appearance&period;Instead&comma;its detailed structure is properly trimmed&comma;it can make the concrete surface softer pleasing visual effect&period;8&period;Help to improve production efficiency and economic benefits&period;In order to make a reasonable economic evaluation&comma;comprehensive economic efficiency indicators need consideration of factors&comma;like long-term benefits &comma;short-term benefits&comma;one-time investment&comma;maintenance and materials management costs&comma;easy and difficulty of construction&comma;etc&period; Practical applications of the fibers could prove using fibers can achieve better economic efficiency&period;

RECOMMENDATIONS&colon;It is a physical effect the reinforcement for concrete &sol; mortar enhancement&comma;rather than chemical action&period;There will be no conflict and chemical reactions with concrete aggregates&comma;admixtures&comma;cement&comma;and it has good adaptability with concrete materials&comma;it does not affect the addition of other concrete admixtures usage&comma;their function independently of each other&period;PAN fiber can not replace structural reinforcing material&comma;don't decrease the body structure size because of using PAN fiber&period;PAN fiber alone could not solve the settlement&comma;massive concrete hydration heat and a strong external shocks occasions&semi;It also need maintenance and following of construction regulation&period;

RECOMMENDED DOSAGE&colon;Generally to meet the requirements for surface crack&comma;1 CBM concrete mixing 1kg fiber&period; For special using like basement seepage prevention need 1&period;5kg&sol;m3 to 3&period;0kg&sol;m3&comma;abide by engineering design criteria&period;

STORAGE&colon;The PAN fiber chopped strands should be keep dry in their original cartons and stored in a suitable place&comma;preferably at room temperature with 35-65&percnt; relative humidity&period;Avoid the sun&comma; rain and fire